thereissth现在分词

为There be 结构。there is sth doing 中文意思是有某事在做……

例如

There is a fine line between showing interest in what someone is doing and interfering in it.关心别人正在做的事情和进行干预之间存在着细微的差别。

There is a boring guy doing something boring.有一个无聊的人在做一些无聊的事情。